I have a problem while trying to get the accelerometer data using the HTML 5 interface.
I declare this handler event:
window.addEventListener("devicemotion",getMontionData,true);
to get the data provided by the accelerometer sensor. On the other hand, I have a function called as getMontionData:
getMontionData = function (e)
{
xAcceleration = e.acceleration.x;
yAcceleration = e.acceleration.y;
zAcceleration = e.acceleration.z;
}
to get the accelerometer data. The problem that I have is that the getMontionData function is not called when the device is locked or the screen is on black.
I'm doing this test on a smart watch using Tizen IDE and it is set this property
Could anybody explain me how to enable the application to get data even though the device is locked or the screen is on black?
While the application main window is displayed, the devicemotion event should be called since the getMontionData function is called. The problem happens, when the device screen is on black
Thank you so much
Try adding this line to test if event gets triggered, if it does - find out why it's not being fired.
$(document).trigger('devicemotion');
Try adding the following setting to your config.xml as described in the documentation:
<tizen:setting background-support="enable" />
Without this the application can't run in the background, so the event doesn't work.
Related
I've encountered a case where I'm calling code that causes a flicker in a bitmap data. Without changing the frame rate to a much higher value (don't know if this is possible to change dynamically at runtime) is it possible to redraw the frame quickly?
In the old days you could cause Flash Player to manually update the frame by calling updateAfterEvent(). Does this still work? Is there another way to update the frame?
Here is what I have so far:
// force redraw
var updateEvent:MouseEvent = new MouseEvent(MouseEvent.MOUSE_MOVE);
updateEvent.updateAfterEvent();
If it's local variables will this get garbage collected?
If you're changing a something during enter frame listener, it should get updated automatically. Otherwise, use updateAfterEvent() in a non-enterframe listener.
function onMouseMove(e:MouseEvent):void {
// ... code that changes something
e.updateAfterEvent();
}
I can't for the life of me get the following functionality to work:
User taps item
Item's image becomes visible via changing visibility property of image
After a short period of time image becomes invisible again (with no user input) via changing the
visibility property
Or, more simply:
Make visible UI change
Pause so user can see UI change
Reverse step 1's UI change
Step 2 happens before steps 1 and 3 regardless of where the code is because the UI is not updating until the logic finishes (I assume).
I am setting the visibility of the image via data binding with INotifyPropertyChanged. All works as expected except when I'm trying to introduce the pause.
I'm trying to pause with this simple method:
private void Pause()
{
new System.Threading.ManualResetEvent(false).WaitOne(1000);
}
It does pause, but the UI changes wait until after that pause even though a change to the bound data happen befores the pause is called, and the other change after.
I have tried using the dispatcher, but it doesn't change anything, and I don't understand it enough:
await dispatcher.RunAsync(CoreDispatcherPriority.High, () =>
{
clickedCard.IsFaceDown = false; // makes the image visible via data binding
}
);
Pause();
I think I need to do something with threading, but I am going in circles.
Any ideas?
You should never do something like this inside the UI thread of your app:
new System.Threading.ManualResetEvent(false).WaitOne(1000);
There are various reasons for not doing it, but in your particular case the problem is that XAML only re-draws once your event-handler completes. So basically this happens:
The item is invisible
Your event handler is called
You set it to visible (but the UI doesn't refresh yet)
You freeze the thread for a second
You set it to invisible again
The event-handler completes
Now the UI updates based on the current value (which is invisible)
I suggest you look at building a Storyboard to do this - Blend can help. See here.
I'm creating a little developer console for an AS3 AIR application, I'm wanting F12 to add the toggle the display of the console screen but I don't want to litter my program with a bunch of calls to the Console to show or hide it, I also don't really want to be re-creating the console on different screens of my application.
I'm wondering if there's a way or a place I can put my keyboard event to toggle the display that will handle it across the entire application? At the moment I've tried putting it into my Main class which calls the first screen in the hopes that would be able to handle it but as soon as I click on another screen my eventListener isn't called.
Any ideas?
You could add your event listener to FlexGlobals.topLevelApplication instead of specific views, this would achieve the reduction you require
For true application level keyboard handling, attach the listener on the NativeApplication.nativeApplication object.
NativeApplication.nativeApplication.addEventListener(KeyboardEvent.KEY_DOWN, toggleDevConsole,false,0,true);
Attaching the listener to the stage will only work when that particular stage (window) has the focus. This will become an issue if your application has multiple windows that require interaction.
For single window applications, either will work.
Woops, I'm not quite with it today!
For future reference I added the event listener to the Stage in my Main function and it's being picked up every time.
stage.addEventListener(KeyboardEvent.KEY_DOWN, toggleDevConsole, false, 0, true);
I have one swing code written by other person. For swing tabbed pane, he has added both change and container listener and both calls the same method:
addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent theEvent ) {
someMethod();
}
} );
addContainerListener(new ContainerAdapter() {
public void componentAdded(ContainerEvent theEvent) {
someMethod();
}
public void componentRemoved(ContainerEvent theEvent) {
someMethod();
}
} );
Whenever tab is removed from this tabbed pane, it internally calls JTabbedPane.removeTabAt(int index), which in turn calls fireStateChanged() causing new change event listened by change listener.
Now as new component (tab) is removed from tabbed pane, it also calls componentRemoved(ContainerEvent theEvent) method of container listener.
Both change even and container events, then calls same method someMethod(), which does set background and foreground colors.
I would like to know, if this kind code might cause some issues. Recently we are facing random IndexOutOfBoundException exeptions. I am just wondering, if this is causing this issue.
Also as per my understanding in swing, once event is listened, logic inside it should be executed using worker thread (e.g. SwingWorker). Please let me know if this is correct.
I am new to swing, thus any hint would be appreciated.
Thanks.
Whenever tab is removed from this tabbed pane, it internally calls
JTabbedPane.removeTabAt(int index), which in turn calls
fireStateChanged() causing new change event listened by change
listener.
This is true if the removed tab is also the selected tab. In the other cases, you won't be notified.
You need to choose what event you want to listen to:
Addition/Removal of components?--> go for ContainerListener
Selected tab? --> go for ChangeListener
I would like to know, if this kind code might cause some issues.
Recently we are facing random IndexOutOfBoundException exeptions. I am
just wondering, if this is causing this issue.
Since there is no line in your sample code that could throw that Exception, it is impossible to answer your question. Post an SSCCE that shows your issue.
Also as per my understanding in swing, once event is listened, logic
inside it should be executed using worker thread (e.g. SwingWorker).
Please let me know if this is correct.
It depends:
If you need to modify anything in the UI, anything related to Swing, it needs to be executed on the EDT (Event Dispatching Thread) and thus, SwingWorker is not an option.
If you need to perform business logic operations, and especially if they can be lengthy, then you should indeed use a SwingWorker or any other mechanism to execute that code in another thread than the EDT. Consider visiting the Swing tag wiki on "Concurrency"
I know the method MouseEvent.updateAfterEvent() or KeyboardEvent.updateAfterEvent() which will force a re-render of the stage just after the event is handled rather than waiting for the next frame.
However, I need a method to force an immediate render at the very moment I call it. Is there such a method?
Actually my problem comes from the demential design of ActionScript's printing API (PrintJob). Inconsistent with the whole ActionScript architecture, when you call PrintJob.start(), everything is completely frozen while the printing dialog is shown until the user clicks the print or cancel button. Execution of any code after the PrintJob.start() call is resumed after that.
Among a lot of other much worse issues coming from this gigantic design flaw, there is mine:
public function someMouseOrKeyboardEventHandler() {
somethingThatUpdatesTheDisplayList();
var somePrintJob=new PrintJob();
somePrintJob.start();
//...
somePrintJob.send();
}
When this handler of mine is called, the changes made to the display list will not be visible until after the printing dialog has been closed, so I can't, for example, show something on the screen just before I open the print dialog.
updateAfterEvent() won't help a bit (already tried it). It won't change a thing, since it only forces rendering after the event handler code is executed.
Is there any updateRightNow()-like thing?
Nope, you unfortunately can't force an update in the middle of your code.
You can, however, wait until the next frame to call start() on the PrintJob; this will give Flash time to update the stage before everything freezes.